H. pylori infection is recognized as a causal factor in the pathogenesis of chronic gastritis, peptic ulcer, gastric cancer, and gastric MALT lymphoma.
幽门螺杆菌感染被认为是慢性胃炎、消化性溃疡、胃癌和胃malt淋巴瘤发病机制中的一个必然因素。
A good deal of research has been devoted to the study of foreign language anxiety in recent years. Yet very few studies have referred to culture as a causal factor in foreign language anxiety.
近年来有大量致力于外语语言焦虑的研究出现，但是将“受文化因素影响的外语语言焦虑”作为研究重点的却不多见。
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